Product Description
Keep high-resolution balances accurate between service visits with OHAUS UltraClass individual reference weights, made for primary-reference work and traceability to national standards. They are sized for checking balances that read to 0.01 mg, as well as for calibrating ASTM Class 1 and lower working weights.
This listing is for OHAUS item number 30390214: UltraClass ASTM Reference Weight, 300 mg, One-Piece Flat, with Non-Accredited Calibration Certificate. Construction depends on value: 1 g and larger weights are two-piece cylinders, some with a handling knob or grip handle, and 500 mg and smaller weights are flat one-piece pieces. Material options include Alloy 8 stainless steel and 303, 304 or 316 stainless steel, with tolerances specified for each denomination. Pick no certificate, a traceable certificate, or an ISO/IEC 17025 accredited certificate. Order it from LIGHT LABS alongside the rest of your OHAUS balances, weights and lab equipment.
Key Features
- Primary-Reference Accuracy – UltraClass tolerances suit calibrating ASTM Class 1 and lower weights and balances that read to 0.01 mg
- Value-Matched Design – Two-piece cylinders from 1 g up, flat one-piece wafers at 500 mg and below for tweezer handling
- Certificate Choice – Order with no certificate, a traceable certificate, or an ISO/IEC 17025 accredited certificate with uncertainty
- Corrosion-Resistant Materials – Alloy 8, 303, 304 or 316 stainless steel, with aluminum for some milligram values
- Grip-Handle Options – EB grip-handle versions of heavy kilogram values allow safer lifting and placement
- Protective Storage – Most values ship in a protective case to limit handling damage and contamination
Specifications
| Item Number | 30390214 |
| Brand | OHAUS |
| Description | UltraClass ASTM Reference Weight, 300 mg, One-Piece Flat, with Non-Accredited Calibration Certificate |
| Calibration Certificate | Traceable Certificate |
| ASTM Class | UltraClass |
| Weight Value | 300 mg |
| Design | Flat |
| Protective Case | Included |
| Construction | One-piece |
| Density at 20°C | 7.95 g/cm3 |
| Dimensions | 0.33 in x 0.12 in x 0.3 in (0.83 cm x 0.305 cm x 0.76 cm) (LxHxW) |
| Dimensions in Case | 2.5 in x 2 in (6.35 cm x 5.08 cm) (HxØ) |
| Weight Material | 304 Stainless Steel |
| Weight Tolerance | 0.005 mg |
| Wgt Origin (USA) | USA |
| Weight Grade | UltraClass |
| Certificate Options | None, Traceable, ISO/IEC 17025 Accredited |
| Country of Origin | USA |
Related Models
- 30390182 – UltraClass ASTM Reference Weight, 300 mg, One-Piece Flat, No Certificate
- 30390247 – UltraClass ASTM Reference Weight, 300 mg, One-Piece Flat, with Accredited Calibration Certificate
- 30390291 – UltraClass EB Cylindrical Reference Weight, 4 kg, Two-Piece, No Certificate
- 30390353 – UltraClass EB Cylindrical Reference Weight, 4 kg, Two-Piece, with Accredited Calibration Certificate
- 30390354 – UltraClass EB Grip Handle Reference Weight, 4 kg, Two-Piece, with Accredited Calibration Certificate
- 30390322 – UltraClass EB Cylindrical Reference Weight, 4 kg, Two-Piece, with Non-Accredited Calibration Certificate
- 30390323 – UltraClass EB Grip Handle Reference Weight, 4 kg, Two-Piece, with Non-Accredited Calibration Certificate
- 30390274 – UltraClass EB Cylindrical Reference Weight, 40 g, Two-Piece, No Certificate
- 30390336 – UltraClass EB Cylindrical Reference Weight, 40 g, Two-Piece, with Accredited Calibration Certificate
- 30390305 – UltraClass EB Cylindrical Reference Weight, 40 g, Two-Piece, with Non-Accredited Calibration Certificate
- 30390284 – UltraClass EB Cylindrical Reference Weight, 400 g, Two-Piece, No Certificate
- 30390346 – UltraClass EB Cylindrical Reference Weight, 400 g, Two-Piece, with Accredited Calibration Certificate
- 30390315 – UltraClass EB Cylindrical Reference Weight, 400 g, Two-Piece, with Non-Accredited Calibration Certificate
- 30390187 – UltraClass ASTM Reference Weight, 5 g, Two-Piece Cylindrical, No Certificate
Applications
- Calibration of analytical and semi-micro balances
- Primary reference for ASTM Class 1 working weights
- Metrology and calibration laboratories
- ISO/IEC 17025 and GLP quality programs
- Routine balance performance checks
- Mass comparison and traceability chains
